This is a rubber band latch on a platform that I'm testing for an a project of mine. Though I realized it won't work for my project, I'm still uploading it in case someone else can find a use for it It is wide enough to get my finger into the rubber band to "latch" and "unlatch" it. Outside of the 3d printed part, you will require some sort of stick for it to pivot on and one or more rubber bands to catch onto the hook. The holes for the pivot are dimensioned at 2mm, and the width between the arms is ~15 mm.
To assemble it, you will need:
- A rubber band
- The printed parts
- A rod slightly less than 2mm in diameter, and more than 30 mm long
Creating the Hinge
Assemble the arms onto the main body by sticking the rod through one arm and gluing it. Then stick the rod through the hole in the main body such that the tapered edge is facing outwards. Take the other arm, and place it onto the rod on the other side of the main body, with its taper also facing outwards. Glue the second arm onto the rod facing the same direction as the first.
Adding a Rubber Band
Add glue to the dip on one of your arms. With the arms facing opposite the hook (as if it were open), lightly stretch your rubber band and press it onto the glue. Leave any extra length of rubber band on for now. Run the rubber band along the outside of the arm and through the hole just below the dip. Run the rubber band straight across the gap between the arms, and through the hole on the other arm. If you are using a wide rubber band, you may need to fold it to get it through the holes. Add some glue to the dip on the second arm, and lightly stretch the rubber band before pressing it into the glue. Do not over-tension the rubber band. Cut off the extra length of rubber band.
If you over-tensioned the rubber band:
You will need to cut the rubber band, likely with a knife, then repeat the instructions listed under "Adding a Rubber Band".